9+7x-3-4x=27
7x-4x=27-9+3
3x=21
x=21/3
x=7
8x-7+x=5x+21
8x+x-5x=21+7
4x=28
x=28/4
espero que te sirva
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9+7x-3-4x=27
7x-4x=27-9+3
3x=21
x=21/3
x=7
8x-7+x=5x+21
8x+x-5x=21+7
4x=28
x=28/4
x=7
espero que te sirva